ASP.NET实现纯文本转HTML ,可以实现的功能:输入:"ab\r\ncde\r\nfghi"输出:"<p>ab</p><p>cde</p><p>fghi</p>"，注意无论任何输出<p>和</p>都要配对出现，且<p>和</p>之间不能为空
public static string Text2HtmlSimple(string input)
02 {
03 StringBuilder sb = new StringBuilder();
04 sb.Append("<p>");
05 int index = 0;
06 do
07 {
08 string toAppend = string.Empty;
09 int pos = input.IndexOf("\r\n", index);
10 if (pos == 0)
11 {
12 index = pos + 2;
13 }
14 else if (pos == input.Length - 2)
15 {
16 toAppend = input.Substring(index, pos - index);
17 if (!string.IsNullOrEmpty(toAppend))
18 {
19 sb.AppendFormat("{0}</p>", toAppend);
20 }
21 index = pos + 2;
22 }
23 else if (pos > 0)
24 {
25 toAppend = input.Substring(index, pos - index);
26 if (!string.IsNullOrEmpty(toAppend))
27 {
28 sb.AppendFormat("{0}</p><p>", toAppend);
29 }
30 index = pos + 2;
31 }
32 else
33 {
34 toAppend = input.Substring(index, input.Length - index);
35 sb.AppendFormat("{0}</p>", toAppend);
36 break;
37 }
38 }
39 while (index < input.Length);
40 return sb.ToString();
41 }
